Bearings have built-in sensors.A combination sensor/bearing unit uses an active sensorprinciple that functions like an incremental encoder to giveaccurate measuring down to zero speed.The device consists of a deep groove ball bearing fitted with a singleseal and a built-in sensor that features an impulse ring, a sensor bodyand connecting cables.Together they form a labyrinth seal on the opposing side of the bearing.It provides information about the status of travelling machine parts andenables both open and closed ioop control of these movements.A main feature of the units is their insensitivity to electromagnetic fields-considered essential to trouble-free running in electrically chargedenvironments.Originally developed for anti-locking brakes, sensor/bearings can beused for recording revolutions, speed, direction of rotation, relativeposition, acceleration and deceleration.Being robustly constructed, they are insensitive to vibration and hightemperatures and give uniform output signals.The compact design enables the combination units to take only a littlemore space than conventional bearings, and the range covers borediameters from 15 to 45mm._______________________________________________For more information contact:-SKF (UK)Luton, Beds. UKOctober 2001